Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 195 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.Which job needs a motion sensor? (a) start a fan when hot (b) spot someone walking in (c) water a dry plant (d) measure classroom noise
2. 2.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) start a fan when hot (d) water a dry plant
3. 3.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
4. 4.Which job needs a gas sensor? (a) close a window in rain (b) warn of a gas leak (c) spot someone walking in (d) measure classroom noise
5. 5.Which job needs a light sensor? (a) warn of a gas leak (b) start a fan when hot (c) open blinds at sunrise (d) keep an incubator warm
6. 6.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
8. 8.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a soil moisture sensor (c) a distance sensor (d) a sound sensor
9. 9.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
10. 10.Which job needs a distance sensor? (a) keep an incubator warm (b) stop a robot near walls (c) close a window in rain (d) warn of a gas leak
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a motor (d) a buzzer
12. 12.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
13. 13.Which job needs a temperature sensor? (a) close a window in rain (b) switch on with a clap (c) start a fan when hot (d) make a parking alarm
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) an LED (d) a display
16. 16.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a sound sensor
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a distance sensor
18. 18.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) show a status light (d) turn to an exact angle
19. 19.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
21. 21.Which job needs an LED? (a) beep an alarm (b) move water to plants (c) show the temperature (d) show a status light
22. 22.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) turn to an exact angle
23. 23.Which job needs a light sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) water a dry plant (d) keep an incubator warm
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) an LED (d) a servo motor
25. 25.Which job needs a sound sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) water a dry plant (d) switch on with a clap
26. 26.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
27. 27.Which job needs a pump? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) turn to an exact angle
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
30. 30.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
32. 32.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
33. 33.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
34. 34.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a pump (c) a display (d) a servo motor
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.Which job needs a sound sensor? (a) measure classroom noise (b) stop a robot near walls (c) water a dry plant (d) open blinds at sunrise
38. 38.True or false: to warn of a gas leak, use a motion sensor. (a) False (b) True
39. 39.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
40. 40.Which job needs a temperature sensor? (a) close a window in rain (b) keep an incubator warm (c) switch on lamps at dusk (d) measure classroom noise

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